title: Osteoarthritic cyst mimicking patellar osteonecrosis.
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D020370:Osteoarthritis, Knee / Q000175:diagnosis*; D010020:Osteonecrosis / Q000175:diagnosis*; D010329:Patella; D013581:Synovial Cyst / Q000175:diagnosis; D014057:Tomography, X-Ray Computed